Electromegaphone-receiver, &amp;c.



C. K. CREGIER.

ELECTROMEGAPHONE RECEIVER, 61c.

APPLICATION EILEJJ 110v. 13. 1911.

1,142,875., Patented June 15, 1915.

3 SHEETSSHEET 1.

C. K. CREGIER.

ELECTROMEGAPHONE RECEIVER, &c.

APPLICATION FILED NOV. 13, 1911.

1, 142,875 Patented June 15, 1915.

3 SHEETSSHEET 2.

C. K. CREGIER.

ELECTROMEGAPHONE RECEIVER, &c.

APPLICATION 111w 110v.1a, 1911.

1,142,875., Patented June 15, 1915.

3 SHEETSSHEET 3.

.66 of on line 77 of Fig. 2.

In all of the views the same reference 10 is supported on base plate 11.

CHARLES K. CREGIER, or CHICAGO, lILLINOIS.

ELECTEOMEGAPHONE-RECEIVER, 8w.

Specification of Letters Patent.

Patented June 15, 1915.

Application med November 13, 1911. Serial njesassl.

To all whom it may concern Be it known that I, CHARLES K. CREGIER, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electromegaphone-Receivers, &c., of which the following is a full, clear, and exact specification.

My invention relates to improvements in loud speaking telephones or electro-megaphone receivers. Y

One of the objects of my invention is to provide a telephone'receiver which will, by aid of a constantly moving mechanical means and an amplifying horn, so magnify and reproduce the sounds spoken into an ordinary telephone transmitter at a remote point, that said sounds will be clearly audible and distinct within a large area surrounding the reproducing instrument.

,A'Ii'other object of my invention is to so improve instruments of this general charaeter to the end that sounds uttered thereby are many times louder than corresponding sounds directed to the transmitter and so characterized as to preserve the timbre and tone without the introduction of inharmonious artificial metallic rasping accompaniment so common and so disagreeable in graphaphone reproduction.

Other and further objects of my invention will become readily apparent to persons skilled in the art from a consideration of the hereinafter contained description taken in conjunction with the drawings, wherein:

Figure 1 is a side elevation of the receiving and 'enunciating device. Fig. 2 is a rear ele- 'vati'on of same. Fig. 3 is a transverse section taken on line 3-3 of Fig. 1. Fig. 4 is a vertical section taken on line 44 of Fig. 3. Fig. 5 is a section takenon line 5-5 of Fig. 1. Fig. 6 is a section taken 'on line Fig. 2 and Fig. 7 is a section taken characters indicate similar parts.

In the exemplification selected for complete disclosure of my invention a stand it rd he standard is bifurcated at its upper end providing two bifurcated prongs 12-12. A circular diaphragm frame 13 is provided with a depending perforated lug 1a which is secured to the standard by bolt 15. Thus the angularityof the' diaphragm frame with reference to the standard may be adjusted.

The frame 13 is provided with a front wall from the center of which projects a perforated boss 16 to which is secured an amplifying horn, 17, as by a bayonet joint, 18, a d1aphragm 19 is secured at its edges bv screws taking through the frame 13, as at 56 and at the other two bosses made on the edge of the frame. The frame 13 is made in two parts and these screws clamp the two parts together over the edge of the diaphragm. A rear portion of the diaphragm frame 20 extends inwardly and afi'ords support for the plate 21, which is secured thereto by screws 22. At the inner end of the plate 21 a projecting bracket 23, perforated as at 24, affords support for a swingm arm 25 which is pivoted thereto by screw 26.

A flexible shaft 27, has rotary bearing in the arm 25, as at 28, the other end of which is supported in a bearing 29 of the bracket The shaft is composed of reduced sections 31 and 32 on respective ends and between them is connected a flexible section 33 which may be composed of a soft rubber tube 33 the ends of which are thrust into thimbles 34: and 35 respectively and are rotatably secured to the shaft parts, 31 and 32 by screws 36 and 37 respectively. This flexible section will allow axial displacement of the free end of the shaft with reference to the other end, so that the end supported in the pivoted arm may be laterally moved with reference to the fixed end 32. To the end 32 is secured a driving pulley '38, as by a screw 39. The shaft is squared as at 40, over which is placed a wheel 1], which is provided with a perforation correspondingly squared. By this means the wheel is positively driven by the shaft. The wheel 41 may be composed of a resinous substance such as amber or the like, having a high friction coeflicient, and it is partially encompassed by a soft rubber strap or girth 4C2, correspondingly tapered. The upper end l3 of the girth is pivotally connected to a link 44 asat 15, the other end of the link is likewise connected to the center of the diaphragm 19 as at 46. The lower end of the girth is pivotally connected to a link 47, which in turn is connected pivotally to a links-8 substantially inclined from the vertical link 18 and this link is connected to another centrally pivoted link 19. A freely movable weighted arm 50 is loosely pivoted tothe; frame 13 as at 51, and this arm bears a lug 52 to which the link 49 is pivoted. A

spring 53 is supported by the bracket ex-' tension 23 and connected to the lower end of the link 48, as at 54, and tends, normally .to yieldingly press the upper end of the link 48 toward the diaphragm and to thereby maintain the friction girth 42 in close contact with the friction wheel 41. A tension spring 55 is secured-at its upper end to the diaphragm frame 13 as by a screw 56, the lower end of the spring is inwardly curved and bears against the swinging shaft bearing arm 25, and yieldingly presses the Wheel 41 into contact with the friction girth thereby to tension the diaphragm 19 by the connecting strap 44.

Now from the foregoing description it will be apparent that if the wheel 38 be rotated in clock-wise at a substantially constant speed that there will be sufficient friction between the friction wheel 41 and the overlying friction strap 42 to tension the diaphragm l9 outwardly by the force applied to the center thereof through the medium of the connecting strap 44. If the position of the strap 42 remains undisturbed While the wheel 38 is being rotated the friction between the contacting members 41 and 42 will be substantially constant and the tension on the diaphragm will be equally constant. If, however, the upper end of the inclined link 48 be moved upwardly andslightly rearwardly, or downwardly and slightly forwardly from its normal position, the eflect will be to increase or decrease respectively the intimacy of contact between the rotating friction wheel and the overlying friction strap thereby varying the tension exerted upon the diaphragm 19 and causing it to quickly assume new po-- sitions accordingly which movement produces audible sounds. I

In order that the tension of the diaphragm 19 may be varied in accordance with vibrations produced by the human voice and other organized sounds I raise and lower the inclined link 48 by means of means responsive to electromagnetic induction and to this end I provide an ordinary telephone receiver 60 having a diaphragm 61 and a permanent magnet 62, and support it on an arm 63, secured to the standard by the bolt 15. To the center of the diaphragm 61 I secure a lug 64 and to this pivot a link 65 the upper end of which is pivoted to the curved link 49. By this arrangement it will be clearly obvious that when the diaphragm 61 is vibrated the intimacy of contact between the friction members will thereby be correspondingly varied and the vibrations of the diaphragm 19 will correspond in frequency their amplitude will be greatly enhanced and the sounds reproduced thereby will have been greatly magnified.

timbre of the voice is faithfully preserved and characteristically reproduced by the am lifying diaphragm.

I ile I have herein described a single, but preferred embodiment of my invention for purposes of complete disclosure, it is evident that many changes may be made therein without departure from the scope of the appended claims.

Having described my invention, what I claim and desire to secure by Letters Patent 1s:

1. In a loud speaking telephone, the combination with a diaphragm to be vibrated; of a constantly-rotatable laterally-movable, friction-producing member; a coiiperating friction-producing member in engagement with the first named member and connected to said diaphragm for tensioning said diaphragm; a spring for yieldingly moving said rotatable member laterally toward its cooperating member to maintain substantially normal uniform engagement of said members and means to vary the frictional engagement of said friction-producing members to vibrate said diaphragm.

2. In a loud speaking telephone, the combination with a diaphragm to be vibrated; of a constantly-rotatable, laterally-movable, friction-producing member; a cooperating friction-producing member in engagement with the first named member and connected to said diaphragm for tensioning said diaphragm; a spring for yieldingly moving said rotatable member laterally toward its cooperating member to maintain substantially normal uniform engagement of said members; a telephone receiver and a connection between the diaphragm thereof and one of said friction-producing members to vary the frictional engagement of said friction producing members to vibrate the first named diaphragm.

3. In a loud speaking telephone, the combination with a diaphragm to be vibrated; of a constantly-rotatable, laterally-movable, friction-producing member; a cooperating friction-producing member in engagement with the first named member and connected to said diaphragm for tensioning said diaphragm; a spring for yieldingly moving said rotatable member laterally toward its cooperating member to maintain substantially normal uniform engagement of said members; another spring tendingto move said cooperating friction-producing member toward said rotatable member; and means --g i to vary the frictional engagement of said "friction-producing members to vibrate said V diaphragm. with the vibrations of the diaphragm 61 but 4. In a device of the character described, the combination of a diaphragm, a rotatable friction Wheel bodily movable with respect to the diaphragm support, a shaft upon the wheel end of said shaft to permitlateral v movement thereof, a spring adapted and arranged to press said bearing in a direction away from said diaphragm, a friction girth overlying said wheel and connected to said diaphragm to resist lateral movement of said wheel, and means connected to said girth to vary its resisting influence;

5. In a device of the character described the combination of a diaphragm, a rotatable friction wheel having a V-shape groove in its peripheral surface, a flexible girth having its confronting surface tapered to fit in said groove, and overlying said wheel, means for rotating N said wheel yielding means for maintaining normal contact relation of said girth and wheel and means for varying said relation.

6. In a loud speaking telephone, the combination with the diaphragm thereof of an electro-magnetically responsive diaphragm; a rotatable, laterally-movable friction-producing means, a spring for laterally moving said rotatable means toward a cooperating friction-producing means; a cooperating friction-producing means in contact therewith and connected. to both diaphragms, whereby to vibrate the first named diaphragm by contact disturbance produced by the second named diaphragm.

In witness whereof, I have hereunto set my hand and afiixed my seal.

CHARLES K. CREGIER. n 8.]

Witnesses:

J NO. G. ELLIOTT, MILDRED ELSNER. 

